HexBug nano platform

My first stl. My kid likes hex bugs, so I expand his house a little bit. Still in testing and work in progress.
Walls - http://www.thingiverse.com/thing:2110222
Posts (for second floor) - http://www.thingiverse.com/thing:2110262
Track - http://www.thingiverse.com/thing:2138143

Edit 22.02.17: Added base_v4.stl - connection was too tight. I edited little bit.

ps. - The size is also an issue for me, it happens sometimes when I export from sketchup objects. When I open stl in cura, I get m